The accusations from Hayden, who also ran the National Security Agency, are the latest in a string of warnings from American officials and congressional committees over the dangers of allowing Huawei to access or build western networks.

But Hayden's warnings are the first to accuse Huawei outright of spying on Beijing's behalf. The former intelligence officer did not provide any details to support his claims, but said that intelligence agencies have accumulated hard evidence.

Hayden currently serves on the board at Motorola Solutions, and is a principal at security consultancy Chertoff Group.

Huawei is one of the world's largest telecommunications companies, offering products that include routers and other Internet gear. It has for years tried to expand operations in the West, only to be met with resistance over security concerns and fears over alleged ties to China's government.

Last year, the U.S. House Intelligence Committee released a report that was critical of the firm's record of intellectual property violations, alleged ties to Iran, and what the committee described as "a pattern and practice of potentially illegal behavior."

Huawei has had more success in the United Kingdom -- but even that partnership is drawing more scrutiny.

U.K. officials said Thursday they would launch a review of a security evaluation center established by Huawei in the country. The center was designed to allow for inspection of Huawei products used in U.K. telecom networks.

Huawei said it welcomes the review.

"Our work with Huawei and their U.K. customers gives us confidence that the networks in the U.K. that use Huawei equipment are operated to a high standard of security and integrity," Sykes said.